He wants someone to be intimidated by him! It makes him feel better about himself! Maybe there was no other creature on the face of the planet that would be scared of him, so he spends his spare time intimidating fish!

I saw that sign as a paying homage to the absurd. He was a very tongue in cheek sort of fellow, so the irony would not have been beyond him.

My keen teenage eyes focused on the sign, trying to puzzle out it’s mystery. I overlooked the fishing pole mounted to the wall. I was blind to the fish hooks and lures decorating the walls. I disregarded the pictures of dear, sweet Mr. Anderson holding up dripping prize catches up by their tails.